Proposal

A group of trees, for example, within a park, in nature, in the hallway, fields and meadows or as a landmark.
Groups of trees can be variously designated. Here called once: Grove (nature), copse of trees, in German: Hain, Gehölz
Since these terms are defined differently for groups of trees in size, use, care and undergrowth, a takeover of one of the concepts is not useful. By the commonly understood term "tree_group" in the style of "tree_row" a definition is chosen, which is available globally, understood and comparable.
Groups of trees are generally not considered to wood or forest.
They may be natural monument, important landmarks, rest area, Shade in the park, considered as an architectural element or as a tree monument, in large planted gardens or simply "sprung from nature" .